Add checks for python and ycmd path existance in Makefile
Add checks for python and ycmd path existance in Makefile

abingham/emacs-ycmd,phst/emacs-ycmd,abingham/emacs-ycmd,phst/emacs-ycmd,ptrv/emacs-ycmd,emacsmirror/ycmd,abingham/emacs-ycmd,ptrv/emacs-ycmd,abingham/emacs-ycmd,phst/emacs-ycmd,ptrv/emacs-ycmd,emacsmirror/ycmd,emacsmirror/ycmd,emacsmirror/ycmd,phst/emacs-ycmd,abingham/emacs-ycmd,ptrv/emacs-ycmd,abingham/emacs-ycmd,ptrv/emacs-ycmd,emacsmirror/ycmd,phst/emacs-ycmd,emacsmirror/ycmd,phst/emacs-ycmd,ptrv/emacs-ycmd